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-rw-r--r--binutils/doc/binutils.texi6
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diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 483b72f..6024301 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -2526,6 +2526,12 @@ can be useful when disassembling object files which do not describe
architecture information, such as S-records. You can list the available
architectures with the @option{-i} option.
+For most architectures it is possible to supply an architecture
+name and a machine name, separated by a colon. For example
+@samp{foo:bar} would refer to the @samp{bar} machine type in the
+@samp{foo} architecture. This can be helpful if objdump has been
+configured to support multiple architectures.
+
If the target is an ARM architecture then this switch has an
additional effect. It restricts the disassembly to only those
instructions supported by the architecture specified by @var{machine}.